Effects of stand age on agronomic, morphological and chemical characteristics of alfalfa
Effects of stand age on agronomic, morphological and chemical characteristics of alfalfa
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DOI：
10.4141/cjps91-061
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发表时间：
1991-04
影响因子：
1.2
通讯作者：
Michio Suzuki
中科院分区：
文献类型：
--
作者：
Michio Suzuki
易洛魁紫花苜蓿(Medicago sativa L.)从1978年到1988年每年春季播种，建立的林分一直维持到1988年秋季。对不同年龄组林分的农艺性状、形态特征和化学特性进行了比较。在播种当年和第一个冬季，紫花苜蓿种群急剧减少。第2年m−2约40株，第8年m−2逐渐减少到25株，第10年−2在12~24株之间。老林分杂草较多。包括杂草在内的牧草总干物质产量并未随年龄的增加而显著降低，但产量却随年龄的增加而降低，且年龄较大的牧草产量下降幅度在刈割1比刈割2更明显。根系发育模式由播种当年的垂直伸展发展到播种后的侧向分枝根系发育。..。
Iroquois alfalfa (Medicago sativa L.) was seeded every spring from 1978 to 1988, and the established stands were maintained until the fall of 1988. Agronomic, morphological and chemical characteristics of the stands were compared among different age groups. A drastic reduction of alfalfa population occurred in the seeding year and during the first winter. There were about 40 plants m−2 in the 2nd yr which gradually decreased to 25 plants m−2 in the 8th yr, and between 12 and 24 plants m−2 in the 10th yr. There were more grass weeds in older stands. Total dry matter yield of forage, including weeds, did not decrease significantly with age of alfalfa stand Alfalfa yield, however, decreased with age, and the reduction in older stands was more evident in cut 1 than cut 2. There was little or no difference in cold hardiness among different stand ages in postseeding years. Root development pattern changed from vertical extension in the seeding year to lateral development of branched roots in postseeding years. ...